Bug 195669

Summary:	Touchpad not detected on Lenovo S21e
Product:	Drivers	Reporter:	Rob van den Berg (rghvdberg)
Component:	Input Devices	Assignee:	drivers_input-devices
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	dmitry.torokhov, nikolas, vbatts
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	4.11.0-041100-generic	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	lshw dmesg devices add the ELAN0601 ID

Description Rob van den Berg 2017-05-05 09:04:20 UTC

Created attachment 256219 [details]
lshw

OS Kubuntu 17.04
Kernel 4.11.0-041100-generic (mainline)
The touchpad isn

I've tried several kernel paramaters

i8042.nomux=1
i8042.reset=1
i8042.noloop=1
i8042.kbdreset=1
i8042.nopnp=1
i8042.debug=1

Comment 1 Rob van den Berg 2017-05-05 09:05:12 UTC

Created attachment 256221 [details]
dmesg

Comment 2 Rob van den Berg 2017-05-05 09:07:17 UTC

Created attachment 256223 [details]
devices

Comment 3 nikolas 2017-09-19 13:37:32 UTC

Can you attach the output of `udevadm info -e` run as root?

Comment 4 Rob van den Berg 2017-09-20 13:45:40 UTC

NOTE : Currently on 4.9.48-1-MANJARO
output was too long so I pastebinned it

https://pastebin.com/HV6CRvFJ

Comment 5 Vincent Batts 2019-02-25 14:50:08 UTC

This is still not working on 4.16.3 and 4.20.8 on Fedora
reading on https://alpha-labs.net/2015/08/lenovo-s21e-linux-and-the-touchpad/
it looks like there had been a fix floated for the hid-rmi module.

Comment 6 Vincent Batts 2019-02-25 15:26:19 UTC

ah, sorry. This looks like an i2c elan touchpad issue. My apologies.
[vbatts@dhcp6-118 ~]$ dmesg | grep -i elan
[    2.442191] i2c_hid i2c-ELAN0601:00: i2c-ELAN0601:00 supply vdd not found, using dummy regulator

Comment 7 Vincent Batts 2019-02-25 19:52:30 UTC

Created attachment 281341 [details]
add the ELAN0601 ID

this is the patch i've emailed to Duson Lin

Comment 8 Vincent Batts 2019-02-25 19:54:10 UTC

Confirmed the patch works on the Lenovo s21e-20 laptop with 5.0.0-rc8 kernel. Surely could be backported to other releases.

Duson's EMC email bounced. What subsystem should I mail this patch to

Comment 9 Dmitry Torokhov 2019-02-28 07:16:54 UTC

Please send to dmitry.torokhov@gmail.com CC linux-input@vger.kernel.org and kt.liao@emc.com.tw

I will need you signed-off-by in the patch description as per Documentation/SubmittingPatches.

Thanks!

Comment 10 Vincent Batts 2019-02-28 13:47:47 UTC

sent

Comment 11 Vincent Batts 2019-03-20 20:25:41 UTC

my fix for this has been merged into master and all stable branches back to v4.4
This issue can be closed now.